Cross-technology coverage mapping system and method for modulating scanning behaviour of a wireless user equipment (UE) device

ABSTRACT

A method for modulating scanning behavior of a wireless user equipment (UE) device includes determining a geographic area location where the wireless UE device is located and responsive to determining that a radio access technology (RAT) previously available in the geographic area location is not currently available, modifying the frequency of searches for the radio access technology. A corresponding wireless user device is also shown.

CROSS REFERENCE TO RELATED APPLICATION(S)

This non-provisional application is a continuation application of U.S.patent application Ser. No. 13/113,622, entitled “CROSS-TECHNOLOGYCOVERAGE MAPPING SYSTEM AND METHOD FOR MODULATING SCANNING BEHAVIOR OF AWIRELESS USER EQUIPMENT (UE) DEVICE”, filed May 23, 2011, which isitself a continuation of U.S. patent application Ser. No. 11/366,705,now issued as U.S. Pat. No. 7,953,410 B2, which discloses subject matterrelated to the subject matter disclosed in the following commonly ownedU.S. patent application(s): (i) “SYSTEM AND METHOD FOR ACCELERATINGNETWORK SELECTION BY A WIRELESS USER EQUIPMENT (UE) DEVICE USINGSATELLITE-BASED POSITIONING SYSTEM,” filed Jul. 1, 2005; applicationSer. No. 11/173,040, in the name(s) of: Adrian Buckley and Gregory ScottHenderson; and (ii) “SYSTEM AND METHOD FOR ACCELERATING NETWORKSELECTION BY A WIRELESS USER EQUIPMENT (UE) DEVICE,” filed Jul. 1, 2005;co-pending application Ser. No. 11/173,083, in the name(s) of: AdrianBuckley, Andrew Allen and Gregory Scott Henderson. The entire content ofeach of the foregoing applications is incorporated herein by reference.

FIELD OF THE DISCLOSURE

The present patent disclosure generally relates to communicationnetworks. More particularly, and not by way of any limitation, thepresent patent application is directed to a cross-technology coveragemapping system and method for modulating scanning behavior of a wirelessuser equipment (UE) device disposed in a radio network environment.

BACKGROUND

When a wireless user equipment (UE) device is first powered up or whenit tries to recover from loss of coverage, it is typically required tosearch for its last registered Public Land Mobile Network (RPLMN) inevery supported radio access technology and frequency bands associatedtherewith before attempting to register on another PLMN. The issue foroperators is that when a UE device loses coverage from its home PLMN, itmay have to perform a full band scan (FBS) of all supported bands beforepossibly selecting a National Roaming Partner (NRP). Today, such a fullscan already takes a fairly long time in a dense or complex radioenvironment, which will be further exacerbated when additional frequencybands are introduced and more access technologies (e.g., Wireless LocalArea Network (WLAN) technologies) are integrated.

In addition, it is important to note that in most scenarios a full bandscan can give rise to inefficient utilization of radio resources as wellas battery power of a device. Relatedly, the time to perform a full scanmay be so long that the radio environment may have changed significantlybetween the time when the scan was started and the time the UE devicedecides to select a new PLMN, for example, due to roaming. As a result,by the time the UE decides to select a new network, coverage of a highpriority or more optimal network may have become available.

SUMMARY

Broadly, the present disclosure is directed to a cross-technologycoverage mapping system and method suitable for modulating scanningbehavior of a wireless UE device in a radio network environment. In oneaspect, the wireless UE device is operable to determine its geographicarea location. Responsive to determining that a radio access technologypreviously available in the geographic area location is not currentlyavailable, modifying the frequency of searches of for the radio accesstechnology.

In another aspect, the present disclosure is directed to a computerreadable medium, encoded with instructions that, when executed by aprocessor of a user equipment (UE) cause the UE to perform a method thatincludes determining a geographic area location where the wireless UEdevice is located and responsive to determining that a radio accesstechnology previously available in the geographic location is notcurrently available, modifying the frequency of searches for the radioaccess technology.

In another aspect, the present disclosure is directed to a wireless userequipment (UE) device operable to modulate its scanning behavior. The UEdevice includes a processor operably coupled to a memory, a logic moduleadapted to determine a geographic area location where the wireless UE islocated, and a logic module adapted, responsive to determining that aradio access technology previously available in the geographic arealocation is not currently available, to modify the frequency of searchesfor the radio access technology, the logic modules including one ofhardware, firmware and software stored in the memory.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete understanding of the embodiments of the present patentdisclosure may be had by reference to the following Detailed Descriptionwhen taken in conjunction with the accompanying drawings wherein:

FIG. 1 depicts a generalized network environment wherein an embodimentof the present patent disclosure may be practiced;

FIG. 2 depicts an exemplary embodiment of a technology coverage databasein accordance with the teachings of the present patent disclosure;

FIGS. 3A and 3B depict further exemplary embodiments of a technologycoverage database in accordance with the teachings of the present patentdisclosure;

FIG. 4 depicts an exemplary architecture for providing a technologycoverage database;

FIG. 5A is a flowchart of a method according to one embodiment of thepresent disclosure;

FIG. 5B is a flowchart of a method according to another embodiment ofthe present disclosure; and

FIG. 6 depicts a block diagram of an embodiment of a wireless UE deviceoperable according to the teachings of the present patent disclosure.

DETAILED DESCRIPTION OF THE DRAWINGS

A system and method of the present patent disclosure will now bedescribed with reference to various examples of how the embodiments canbest be made and used. Like reference numerals are used throughout thedescription and several views of the drawings to indicate like orcorresponding parts, wherein the various elements are not necessarilydrawn to scale. Referring now to the drawings, and more particularly toFIG. 1, depicted therein is an exemplary generalized radio networkenvironment 100 wherein one or more embodiments of the present patentdisclosure may be practiced. A generalized wireless user equipment (UE)or mobile equipment (ME) device 110 may comprise any portable computer(e.g., laptops, palmtops, or handheld computing devices) or a mobilecommunications device (e.g., cellular phones or data-enabled handhelddevices capable of receiving and sending messages, web browsing, etcetera), or any enhanced personal digital assistant (PDA) device orintegrated information appliance capable of email, video mail, Internetaccess, corporate data access, messaging, calendaring and scheduling,information management, and the like, that is preferably operable in oneor more modes of operation and in a number of frequency bands and/orradio access technologies (RATs). For example, UE/ME device 110 mayoperate in the cellular telephony band frequencies as well as WirelessLocal Area Network (WLAN) bands. Further, other bands in which the UEdevice could operate wirelessly may comprise Wi-Max bands or one or moresatellite bands. Accordingly, for purposes of the present patentdisclosure, those skilled in the art should recognize that the term “UEdevice” or “wireless device” may comprise a mobile equipment (ME) device(with or without any removable storage module or RSM such as a UniversalSubscriber Identity Module (USIM) card, Removable User Identity Module(RUIM) card, a Subscriber Identity Module (SIM) card, or a compact Flashcard, etc.) as well as other portable wireless information appliances,also with or without such RSMs.

By way of illustration, the radio network environment 100 may beenvisioned as comprising multiple, possibly overlapping, communicationspaces capable of providing service to UE device 110 in a number ofRATs, depending on available technology coverage and the capabilities ofthe UE device. Reference numeral 102 refers to a RAT coverage space thatis illustrative of a wide area cellular network (WACN) space accessiblein a particular RAT, designated as RAT-1, wherein suitableinfrastructure such as, e.g., a base station tower 104 may be deployed.It should be apparent that there may exist any number of Public LandMobile Networks (PLMNs) in the WACN space 102 that are operable toprovide cellular telephony services which may or may not includepacket-switched data services. Depending on the coverage area(s) andwhether the user is roaming, WACN space 102 may exemplify one or morehome networks (i.e., home PLMNs or HPLMNs, or equivalent HPLMNs orEHPLMNs) and visited networks (i.e., VPLMNs), each with additionalinfrastructure such as Home Location Register (HLR) nodes, MobileSwitching Center (MSC) nodes, and the like, although not shown herein.Accordingly, by way of generalization, the RAT-1 coverage space 102exemplifying a WACN space may comprise one or more radio access networks(RANs) compliant with at least one of General Packet Radio Service(GPRS) networks, Enhanced Data Rates for GSM Evolution (EDGE) networks(i.e., GSM EDGE RANs or GERANs), Integrated Digital Enhanced Networks(IDENs), Code Division Multiple Access (CDMA) networks, Time DivisionMultiple Access (TDMA) networks, Universal Mobile TelecommunicationsSystem (UMTS) networks, or any 3^(rd) Generation Partnership Project(3GPP)-compliant network (e.g., 3GPP or 3GPP2), all operating with wellknown frequency bandwidths and protocols.

Further, UE device 110 is operable to scan in other RATs as well, e.g.,using one or more generic access networks (GANs) as well as any type ofWLAN arrangements. One or more such RATs are operable to provideshort-range wireless connectivity to UE device 110 via access points(APs) or “hot spots,” and may preferably operate with a variety ofstandards, e.g., IEEE 802.11b, IEEE 802.11a, IEEE 802.11g, HiperLan andHiperLan II standards, Wi-Max standard (IEEE 802.16 and IEEE 802.16e),OpenAir standard, and the Bluetooth standard (IEEE 802.15). By wayillustration, reference numerals 108A and 108B refer to two AP coverageareas in using a particular RAT, designated as RAT-2, that may be partof a WLAN operated by an enterprise, business, or any other entity.Likewise, reference numerals 106A and 106B refer to two AP coverageareas in using another RAT, designated as RAT-3, that may be part of yetanother WLAN arrangement.

As alluded to in the foregoing sections, UE 110 is operable to scan inmultiple RATs using applicable bands and frequencies, either as aninitial scanning process or as a background scanning process.Accordingly, because which RATs may overlap is dependent on a particulargeographic location, UE 110 may modulate its scanning behavior based onwhere it is located by using a cross-technology coverage database schemethat is set forth below in additional detail.

In essence, a scheme is provided that allows for recording of the areasor locations where there is overlapping coverage of two or moreRANs/RATs. Information from available networks is captured in a databaseto build a map with respect to overlapping coverage areas. For example,the information may be a set of identifying values for each network orRAT. In one embodiment, these values for overlapping coverage may becorrelated to create a map of which networks have shared coverage withwhich other networks. By way of exemplary implementation, cellidentifier information may be utilized in cross-correlating suchoverlapping coverage for different networks and technologies. Forinstance, as is well known, each of the wide area cellular PLMNs may bearranged as a number of cells, with each cell having sectors (e.g.,typically three 120-degree sectors per base station (BS) or cell). Eachindividual cell may be provided with an identifier, e.g., a cell globalidentity or CGI parameter in GSM networks, to identify them. Also inGSM, a group of cells is commonly designated as a Location Area (LA) andmay be identified by an LA Identifier (LAI). At the macro level, thePLMNs may be identified in accordance with the underlying cellulartechnology. Continuing with the GSM technology as an example, aGSM-based PLMN may be identified by an identifier comprised of acombination of a mobile country code (MCC) and a mobile network code(MNC). On the other hand, CDMA/TDMA-based PLMNs may be identified by aSystem Identification (SID) parameter and/or a Network Identification(NID) parameter. Regardless of the cellular infrastructure, all cellsbroadcast the macro level PLMN identifiers such that a wireless device(e.g., UE device 110) wishing to obtain service can identify thewireless network.

Similarly, coverage areas of various WLANs may also be identified usingvalues such as Service Set Identifiers (SSIDs) or Extended SSIDs(ESSIDs). For instance, continuing to refer to FIG. 1 as an illustrativeexample, each RAT-2 and RAT-3 coverage area in the radio networkenvironment 100 may be identified with a corresponding SSID/ESSID,wherein one or more WLANs may share coverage with RAT-1 space 102.Accordingly, a cell identifier for RAT-1 102 may be correlated with SSIDinformation for the RAT-2 and RAT-3 areas when the technologies co-existin the same area. This information may be utilized by UE 110 to modulateits scanning behavior (e.g., scan in only those RATs that have beenascertained to be available in a geographic area and skip scanning onother RATs although the device have the capability to do so).

FIG. 2 depicts an exemplary embodiment of technology coverage database200 comprising cross-technology mapping between geographic location dataand coverage data in accordance with the teachings of the present patentdisclosure. A geographic area/location column 202 identifies variousgeographic areas (Area-1 through Area-m) that are of interest withrespect to developing a coverage map. For each geographic area, anindication is provided whether or not a particular RAT/RAN has coveragethereat. Thus, coverage information for a plurality of RATs (RAT-1coverage 204-1 through RAT-n coverage 204-n) may be recorded on anarea-by-area basis in the database 200. As an example, Area-1 hascoverage with respect to networks operating in RAT-1 and RAT-n, but nocoverage with respect to RAT-2 and RAT-3 networks. Accordingly, when itis determined that a UE device is in Area-1, it can advantageously skipscanning in RAT-2 and RAT-3 bands, thereby saving battery power andextending battery life. Also, because only a subset of RATs are scanned,network selection by the UE device can be accelerated as well.

Referring to FIGS. 3A and 3B, depicted therein are further exemplaryembodiments of a technology coverage database of the present disclosure.The database embodiment 300A of FIG. 3A illustrates cross-correlationsamong a plurality of radio access technologies, e.g., GSM technology302A, WLAN technology 302B, and UMTS technology 302C, wherein a numberof RAN IDs are provided for each technology for a particular geographicarea 306. As illustrated, column 304A identifies multiple RAN IDs forthe GSM technology. Likewise, columns 304B and 306C are provided for theWLAN and UMTS technologies, respectively, with the corresponding RAN IDvalues. As pointed out earlier, the various IDs can be SSID/ESSID values(for WLAN), SIDs (for IS-95 and IS-136), or [MCC,MNC] combinations (forGSM). Accordingly, if a UE device determines that GSM coverage with IDais available, it can interrogate the database structure 300A todetermine that WLAN coverage (with network IDk) as well as UMTS coverage(with network IDc) is also available in Area-1.

The database embodiment 300B of FIG. 3B illustrates another mappingarrangement that correlates geographic area information with technologycoverage information. As illustrated, a number of geographic areas 352are preferably configurably defined, each area having three or morecorners that may be specified in terms of longitude/latitude coordinatepairs. Associated with each geographic area is a list of allowedfrequencies, bands and/or channels, i.e., allowed frequency data 354,that a wireless UE device may use for selective scanning on a RAT-by-RATbasis for available RATs in that area. In a further modification, atleast a portion of the geographic areas 352 may also be associated witha list of forbidden frequencies, bands and/or channels, i.e., disallowedfrequency data 356, that a wireless UE device is barred from using fordifferent RATs in that area. Those skilled in the art should recognizeupon reference hereto that the database structure 300B is capable of anumber of modifications and variations such as, e.g., providing onlyallowed frequency data, different areas for allowed frequency data anddisallowed frequency data, as well as interfacing with a number of otherdatabase structures described hereinabove.

By way of example, a four-corner geographic area, Area-a, is defined interms of four longitude/latitude pairs: [{Long1 a, Lat1 a}; {Long2 a,Lat2 a}; {Long3 a, Lat3 a}; {Long4 a, Lat4 a}], wherein each paircorresponds to a corner. Likewise, a triangular geographic area, Area-c,is defined in terms of three longitude/latitude pairs: [{Long1 c, Lat1c}; {Long2 c, Lat2 c}; {Long3 c, Lat3 c}]. Clearly, geographic areas ofvarious other shapes may also be defined in a similar manner forpurposes of the present patent disclosure, wherein lines connecting onecorner point to the adjacent corner points determine the boundaries ofthe areas. In a yet another implementation, the geographic areas maysimply be coordinates indicative of the wireless device's position thatis determined using a satellite-based positioning system (SBPS) such asthe Global Positioning System (GPS).

It will be recognized that providing GPS coordinates within across-technology coverage database may add further granularity to thedetermination of geographic area location information. Additionalembodiments of a cross-technology coverage database may includecapabilities and features such as, e.g., (i) coverage information beingadded from other sources (network operators, for instance); (ii)providing preferred and/or barred RAT(s) in a specific geographic areabased on cost, quality, user/network preference, at cetera; (iii)quality metrics such as Received Signal Strength Indicator (RSSI)information for different RAT(s) in a specific geographic area; (iv)adaptive knowledge acquisition such as keeping track of the number ofsuccessful and failed attempts at accessing a specific RAT from alocation area; (v) a time log of each successful/unsuccessful attempt ataccessing a particular RAN; and (vi) additional filtering,prioritization schemes (if multiple RATs are available), and selectioncriteria for different RAT(s) in an area.

Furthermore, in a yet another implementation, an embodiment of thecross-technology coverage mapping database may be provided with aninterface that allows it to be offered as a commercial service tocompanies deploying WLAN hot spots. Accordingly, a WLAN operator mayprovide information regarding its hot spot(s) and their geographiclocation to a database service without a multi-mode UE device actuallyhaving to discover the WLAN's existence. The coverage mapping databasemay also be provisioned with a mechanism to determine if the data for agiven location area is stale. An update algorithm may also be providedto ensure that the coverage mapping data does not become out-of-date.Relatedly, the updating algorithm may be a function of the number ofinquiries per a specified time period (e.g., a day) for a givenlocation.

As an additional variation on the methodology of collecting informationon WLAN hot spots, a currently accessed WLAN may be provided with thecapability to inform the accessing UE device of known neighboring WLANhot spots and their geographic information. Accordingly, a UE devicecould update the coverage mapping database with additional local WLANcoverage areas although it may not be physically located within therange of these neighboring access points.

Regardless of the various extensions, modifications, applications, andimplementations described above, it should be recognized that across-technology coverage database may be provided as local database(i.e., associated with the UE device either in its memory or RSM) orprovisioned as a centralized database on a network. FIG. 4 depicts anexemplary architecture for providing an embodiment of a centralizedcross-technology coverage database 412. As illustrated, the database 412provisioned with cross-technology coverage mapping data may be disposedin a network 410 that is accessible to various UE devices,administrative/provisioning nodes as well as other RAT (cellular and/orWLAN) network infrastructure. By way of example, UE 402A and 402B, eachwith corresponding local databases 404A and 404B, are adapted tointerface with the central database 412. Further, UE 402A is adapted,responsive to a predetermined criterion, to upload and/or update theinformation of the central database 412 via an upload interface 406. Onthe other hand, UE 402B may be able to download at least a portion ofthe central database 412 into its local database 404B via interface 408,which may be based on the location of UE 402B. Reference numerals 414and 416 refer to exemplary administrative network nodes and RAT networkinfrastructure, respectively, that are adapted to update the centraldatabase 412 based on an update algorithm.

Referring now to FIG. 5A, shown therein is a flowchart of a methodaccording to an embodiment of the present disclosure. Upon determininggeographic area location information of a wireless UE device (block502), a technology coverage database (either central or local) isinterrogated by the device to determine which RATs have coverageavailable in the geographic area (block 504). As alluded to previously,the location may be determined in a number of ways, including, e.g.,where the device is operable to derive its location based ontriangulation between WLAN AP locations in the coverage database. Basedon the results of the interrogation, the scanning behavior of the UEdevice (i.e., its scanning algorithm) is modulated, e.g., restrictingscanning in only those RATs that have coverage in the geographic area(block 506). Alternatively or additionally, if the UE device senses onetechnology only, it may increase or decrease the frequency of searchesfor an alternate technology if the database query indicates that thealternate technology was previously seen in that geographic location.

FIG. 5B illustrates a flowchart of another variation according to anembodiment of the present disclosure. Upon determining that a particularRAT is available in a geographic area of a wireless UE device (block520), a technology coverage database (either central or local) isinterrogated by the device to determine which other RATs are alsoavailable in that location (block 522). The interrogation results may beutilized in modulating the scanning algorithm of the UE device asdescribed hereinabove.

FIG. 6 depicts a block diagram of an embodiment of a wireless device orUE/ME device 600 operable to modulate its scanning behavior according tothe teachings of the present patent disclosure. It will be recognized bythose skilled in the art upon reference hereto that although anembodiment of UE 110 may comprise an arrangement similar to one shown inFIG. 6, there can be a number of variations and modifications, inhardware, software or firmware, with respect to the various modulesdepicted. Accordingly, the arrangement of FIG. 6 should be taken asillustrative rather than limiting with respect to the embodiments of thepresent patent disclosure. A microprocessor 602 providing for theoverall control of UE 600 is operably coupled to a communicationsubsystem 604 which includes transmitter/receiver (transceiver)functionality for effectuating multi-mode scanning and communicationsover a plurality of bands. By way of example, a wide area wireless Tx/Rxmodule 606 and a wireless WLAN Tx/Rx module 608 are illustrated. Also, asuitable SBPS/GPS receiver module 610 is provided for effectuatingsatellite-based location determination for purposes as describedhereinabove. Although not particularly shown, each Tx/Rx module mayinclude other associated components such as one or more local oscillator(LO) modules, RF switches, RF bandpass filters, A/D and D/A converters,processing modules such as digital signal processors (DSPs), localmemory, etc. As will be apparent to those skilled in the field ofcommunications, the particular design of the communication subsystem 604may be dependent upon the communications networks with which the UEdevice is intended to operate. In one embodiment, the communicationsubsystem 604 is operable with both voice and data communications.

Microprocessor 602 also interfaces with further device subsystems suchas auxiliary input/output (I/O) 618, serial port 620, display 622,keyboard 624, speaker 626, microphone 628, random access memory (RAM)630, a short-range communications subsystem 632, and any other devicesubsystems, including battery or standby power systems, generallylabeled as reference numeral 633. To control access, an RSM(SIM/RUIM/USIM) interface 634 is also provided in communication with themicroprocessor 602. In one implementation, RSM interface 634 is operablewith an RSM card having a number of key configurations 644 and otherinformation 646 such as identification and subscriber-related data aswell as one or more SSID/PLMN lists, coverage databases and filtersdescribed in detail hereinabove.

Operating system software and other control software may be embodied ina persistent storage module (i.e., non-volatile storage) such as Flashmemory 635. In one implementation, Flash memory 635 may be segregatedinto different areas, e.g., storage area for computer programs 636 aswell as data storage regions such as device state 637, address book 639,other personal information manager (PIM) data 641, and other datastorage areas generally labeled as reference numeral 643. Additionally,appropriate network discovery/selection logic 640 may be provided aspart of the persistent storage for executing the various networkdiscovery/scanning and scanning modulation procedures set forth in thepreceding sections. Additionally or alternatively, another logic module648 is provided for facilitating home network authentication (whereimplemented), location interrogation, etc. Associated therewith is astorage module 638 for storing the SSID/PLMN lists, location-basedselection/scanning filters, capability indicators, et cetera, alsodescribed in detail hereinabove.

It is believed that the operation and construction of the embodiments ofthe present patent application will be apparent from the DetailedDescription set forth above. While the exemplary embodiments shown anddescribed may have been characterized as being preferred, it should bereadily understood that various changes and modifications could be madetherein without departing from the scope of the present disclosure asset forth in the following claims.

What is claimed is:
 1. A method for modulating scanning behavior of awireless user equipment (UE) device, comprising: determining ageographic area location where said wireless UE device is located;responsive to determining that a cross-technology database on thewireless UE device is out-of-date for said geographic area location,updating the cross-technology database for said geographic arealocation; and responsive to determining that a radio access technology(RAT) previously available in said geographic area location is notcurrently available, modifying the frequency of searches for said RAT.2. The method as recited in claim 1, wherein said geographic arealocation is determined by using a satellite-based positioning system. 3.The method as recited in claim 1, wherein said geographic area locationis determined based on one of a cell identifier code and a location areacode available to said wireless UE device.
 4. The method as recited inclaim 1, wherein said determining is performed upon power-up.
 5. Themethod as recited in claim 1, wherein said RAT previously available insaid geographic area location is compliant with at least one of aWireless Network standard selected from IEEE 802.11 standard, IEEE802.16 standard, HiperLan standard, HiperLan II standard, Wi-Maxstandard, OpenAir standard, and Bluetooth standard.
 6. The method asrecited in claim 1, wherein said RAT previously available in saidgeographic area location is compliant with at least one of a GeneralPacket Radio Service (GPRS) network, an Enhanced Data Rates for GlobalSystem for Mobile Communications (GSM) Evolution (EDGE) network, a 3rdGeneration Partnership Project (3GPP)-compliant network, an IntegratedDigital Enhanced Network (IDEN), a Code Division Multiple Access (CDMA)network, a Universal Mobile Telecommunications System (UMTS) network,and a Time Division Multiple Access (TDMA) network.
 7. The method asrecited in claim 1, wherein said frequency of searches is increased. 8.The method as recited in claim 1, wherein said frequency of searches isdecreased.
 9. The method as recited in claim 1, wherein said determiningand said varying are performed upon losing coverage of a network withwhich said wireless UE device was previously registered.
 10. Anon-transitory computer readable medium, encoded with instructions that,when executed by a processor of a user equipment, UE, cause the UE toperform a method comprising: determining a geographic area locationwhere said wireless UE device is located; responsive to determining thata cross-technology database on the wireless UE device is out-of-date forsaid geographic area location, updating the cross-technology databasefor said geographic area location; and responsive to determining that aradio access technology (RAT) previously available in said geographicarea location is not currently available, modifying the frequency ofsearches for said RAT.
 11. The non-transitory computer readable mediumas recited in claim 10, wherein said determining said geographic arealocation comprises using a satellite-based positioning system.
 12. Thenon-transitory computer readable medium as recited in claim 10, whereinsaid determining said geographic area location uses one of a cellidentifier code and a location area code available to said wireless UEdevice.
 13. A wireless user equipment (UE) device operable to modulateits scanning behavior, comprising: a processor operably coupled to amemory containing instructions that when executed by the processorperform the following: determining a geographic area location where saidwireless UE is located; responsive to determining that across-technology database on the wireless UE device is out-of-date forsaid geographic area location, updating the cross-technology databasefor said geographic area location; and responsive to determining that aradio access technology (RAT) previously available in said geographicarea location is not currently available, modifying the frequency ofsearches for said RAT.
 14. The wireless UE device as recited in claim13, wherein determining said geographic area location comprisesreceiving information from a satellite-based positioning system.
 15. Thewireless UE device as recited in claim 13, wherein determining saidgeographic area location comprises using one of a cell identifier codeand a location area code available to said wireless UE device.
 16. Thewireless UE device as recited in claim 13, wherein said determining andsaid varying are performed as a background scan procedure.
 17. Thewireless UE device as recited in claim 13, wherein said determining andsaid varying are performed upon losing coverage of a network with whichsaid wireless UE device was previously registered.
 18. The wireless UEdevice as recited in claim 13, wherein said RAT previously available insaid geographic area location is compliant with at least one of aWireless Network standard selected from IEEE 802.11 standard, IEEE802.16 standard, HiperLan standard, HiperLan II standard, Wi-Maxstandard, OpenAir standard, and Bluetooth standard.
 19. The wireless UEdevice as recited in claim 13, wherein said RAT previously available insaid geographic area location is compliant with at least one of aGeneral Packet Radio Service (GPRS) network, an Enhanced Data Rates forGlobal System for Mobile Communications (GSM) Evolution (EDGE) network,a 3rd Generation Partnership Project (3GPP)-compliant network, anIntegrated Digital Enhanced Network (IDEN), a Code Division MultipleAccess (CDMA) network, a Universal Mobile Telecommunications System(UMTS) network, and a Time Division Multiple Access (TDMA) network. 20.The wireless UE device as recited in claim 13, wherein the instructionsfurther perform applying a prioritization scheme for choosing aparticular RAT for service if multiple RATs are determined have coveragein said geographic area.